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This delta had the very pronounced habit, during certain dry seasons, of sliding. In order to compensate for the encroachments of numerous escarpments, which were at this time always encroaching upon everyone, due to the sliding of the delta. Hymns were composed, which were sung to various gods of the delta and the escarpments. In time, the escarpments ceased to encroach, but the delta continued to slide, which was quite naturally no longer dangerous to the local volk. These hymns continued to be sung altho their aetology was long forgotten. Later they were written down in compensium of sliding delta hymns which were so named. - Fahey, Dance of Death liner notes.